Charlotte solar and wind installation firm Argand Energy Solutions is helping companies use green energy by installing solar panels atop their buildings, including this rooftop in the 1900 block of south Tryon St. Argand Energy installs solar electric, wind energy and solar hot water systems throughout North and South Carolina. North Carolina was the first state in the Southeast to require utilities to use renewable energy in generating electricity. NC residents and businesses that invest in renewable power may receive tax credits.